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Microsoft Defender for Cloud has introduced vulnerability assessment and agentless malware detection for Azure Kubernetes Service (AKS) nodes as a Generally Available (GA) feature. This enhancement strengthens Kubernetes security by identifying vulnerabilities and malicious files without requiring additional agents.
Key Features:
1. Vulnerability Assessment for AKS Nodes
- A new recommendation, “AKS nodes should have vulnerability findings resolved,” is now available in the Azure portal.
- Helps detect and remediate CVEs and security weaknesses in AKS nodes.
- Read more
2. Agentless Malware Detection
- Uses Microsoft Defender Antivirus to scan AKS nodes for malicious files.
- Triggers security alerts when malware is detected.
- Read more
You Should Know:
1. Checking AKS Node Vulnerabilities via Azure CLI
az aks nodepool list --resource-group <ResourceGroup> --cluster-name <AKSCluster> --query "[].name"
To scan for vulnerabilities:
az security va scans list --resource-id /subscriptions/<SubID>/resourceGroups/<RG>/providers/Microsoft.ContainerService/managedClusters/<AKSCluster>
2. Enabling Defender for AKS Nodes
az security auto-provisioning-setting update --name "default" --auto-provision "On"
3. Detecting Malware on AKS Nodes (Agentless Scan)
Use KQL (Kusto Query Language) in Microsoft Sentinel:
[kql]
SecurityAlert
| where ProviderName == “MCAS”
| where AlertName contains “Malware detected on AKS node”
[/kql]
4. Remediating Vulnerabilities
Update AKS node images:
az aks upgrade --resource-group <RG> --name <AKSCluster> --kubernetes-version <LatestVersion>
5. Monitoring Security Alerts
az security alert list --resource-group <RG> --query "[?contains(name, 'AKS')]"
What Undercode Say:
Securing Kubernetes is critical in cloud environments. Defender for Cloud’s agentless scanning reduces overhead while improving threat detection. Key takeaways:
– Patch AKS nodes regularly to mitigate CVEs.
– Use KQL queries to track malware alerts.
– Automate vulnerability scans with Azure Policies.
For deeper security, integrate Defender for Containers with Azure Sentinel for advanced threat hunting.
Expected Output:
[
{
"name": "aks-nodepool1",
"vulnerabilities": [
{
"cveId": "CVE-2023-1234",
"severity": "High",
"status": "Unpatched"
}
]
}
]
Relevant URLs:
References:
Reported By: Markolauren Nodes – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
